NewNameListener.java

/***** BEGIN LICENSE BLOCK *****
 * Version: CPL 1.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Common Public
 * License Version 1.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.eclipse.org/legal/cpl-v10.html
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * Copyright (C) 2006 Mirko Stocker <me@misto.ch>
 * 
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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package org.rubypeople.rdt.refactoring.ui;

import java.util.Collection;

import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Text;
import org.rubypeople.rdt.refactoring.core.IValidator;

public class NewNameListener implements IErrorMessageGenerator {
	private final INewNameReceiver receiver;
	private IErrorMessageReceiver errorReceiver;
	private final Collection<String> fields;
	private final IValidator validator;

	public NewNameListener(INewNameReceiver receiver, IValidator validator, Collection<String> fields) {
		this.receiver = receiver;
		this.validator = validator;
		this.fields = fields;
	}

	public void handleEvent(Event event) {
		 if (event.widget instanceof Text) {
			 String name = ((Text) event.widget).getText();
			 if(isValid(name)) {
				receiver.setNewName(name);
			 }
		 }
	}
	
	private boolean isValid(String name) {
		boolean valid = validator.isValid(name);
		boolean nameAlreadyInUse = false;
		
		for (String field : fields) {
			if(name.equals(field)) {
				nameAlreadyInUse = true;
			}
		}
		
		if(valid && !nameAlreadyInUse) {
			errorReceiver.setError(null);
		} else if (nameAlreadyInUse) {
			errorReceiver.setError(name + Messages.NewNameListener_AlreadyInUse);
		} else {
			errorReceiver.setError(name + Messages.NewNameListener_IsNotValid);
		}
		return valid;
	}

	public void setErrorReceiver(IErrorMessageReceiver errorReceiver) {
		this.errorReceiver = errorReceiver;
	}
}